MOHAMMED MUZAMMIL

Apr 1st, 2018

So net voltage in the primary winding will be (Vin-0) more due to which primary winding draws more current which leads to burning of winding. ... But when a particular High DC voltage is applied to th...

Now assume any type of load; for simplicity I?m assuming it a only resistive load.

And let it be ?R? per phase.

For Delta connected load:

Calculation for per phase power; PD= I2R

Where I ? load current (per phase)

And,

I = ?3Vs/R{as line voltage of the supply is directly applied to the phase of the delta load}

So,

Pd = (?3Vs/R)2R = 3Vs2/Rwatts per phase.

For 3 phases:

P3D = 3Pd = 3*3Vs2/R = 9Vs2/R watts.

Now for Star connected load:

PS = I2R = (Vs/R)2R = Vs2/R watts

For 3 phases: P3S = 3PS = 3 Vs2/R watts

Conclusion:

P3S / P3D =3Vs2/R / 9Vs2/R = 1/3

It may be better concluded by drowing figures. If any variations, can connect to me through karan.sorout@gmail.com

RUP KAMAL KUTUM

Feb 2nd, 2018

Well first you assumed voltage per phase as Vs and Line voltage as sqrt(3) x Vs: Which is for star connection. Then, you assumed the same thing for Delta Connection(where line and phase voltages are t...

Anbumozhi R

Dec 3rd, 2017

Power is Same. Whether it is star to Delta conversion or Delta to star conversion. Power is 1:1

Editorial / Best Answer

Answered by:
joe

Dec 23rd, 2006

100 kw is the full load rating of the generator..... ..that means it can supply 100 kw without exceeding in specified temperature limits .that doesnt mean that it wont be able to supply a load more than 100 kw,it can but not for a longer period of time.after sometime the generator will burn out.if a load of 50 kw is connected to generator the generator will generate only 50 kw& not more than that.the generator will generate power only according to the requirement.

Dharmender

Feb 7th, 2018

Connected Load is 96kw &125kvaDG set will have run stand by unit for Hotel is suitable plz give your technical supporting answer

Mayilsamy Kasipandi

Jul 11th, 2017

The Generator produce the power is exactly what we withdraw as load. 100 kw genset can produce 1 kw to 115kw power depending upon the connected/withdrawing load. Normally the generator can produce 115% of designed rating.

Editorial / Best Answer

Answered by:
NagaseshaReddy.M

Sep 10th, 2007

kVA is the unit for apparent power. Apparent power consists of active and reactive power. Active power is the share of the apparent power which transmits energy from the source (generator) to the user. Reactive power is the share of the apparent power which represents a useless oscillation of energy from the source to the user and back again.

It occurs when on account of some ?inertia? in the system there is a phase shift between voltage and current. This means that the current does not change polarity synchronous with the voltage. But the heat generated in a winding as well as the eddy current losses generated in a transformer core depend on the current only, regardless of whether it aligns with the voltage or not.

Therefore the heat is always proportional to the square of the current amplitude, irrespective of the phase angle (the shift between voltage and current). So a transformer has to be rated (and selected) by apparent power.

Raghu

Feb 9th, 2018

In transformer there is two losses
1. Iron loss
2. Copper loss
The iron loss is depands on Voltage
And the Copper loss is depands on current.

Umar Naik

Nov 26th, 2017

There are cu losses and iron losses which are not dependent on power factor thats why we rated it in KVA.

MADHUSHREE SINHA

Nov 9th, 2015

It is a DC operating point between saturation and cutoff. It must be selected in a way that it does not go into saturation or cutoff.

bala

Oct 24th, 2015

It is more important for a transistor because according to this value, it may operate as an amplifier or a switch and most importantly the point should not vary with temperature hence we normally prefer voltage divider bias.

M.SANTHOSH KUMAR

Aug 7th, 2015

Why we do not give DC supply in transformer means DC current is a direct current, so alternating flux is not produced, because input supply and flux will be same, so emf will not produced and same tim...

avdhesh sharma

Aug 2nd, 2015

Current=voltage/impedance,
When DC is applied then Z=R =>I= V/R and R is low for transformer, so I increases very high, so heating as current is not allowed to flow further and hence intuitively you c...

GARGI VERMA

In Simple words,
There are two type of losses in a transformer;
1. Copper Losses
2. Iron Losses or Core Losses or Insulation Losses
Copper losses ( I2R)depends on Current which passing through tran...

Ayaz Shaik

Jun 29th, 2015

It does not mean always the t/f neutral is connected to ground..only in case of power t/f it happens mainly for two reasons
1) We know all things like harmonics, fault occurrence, lightning, over cur...

Editorial / Best Answer

Actually there is no volt during normal condition. In case of any fault resistor will act as a low resistance path. because above mentioned components are high impedence components. so the huge fault (volt) will be grounded and the equipment remains safe.

shreya

Mar 27th, 2015

Pi is nothing but the proportional integrator controller.it is used improve steady state stability i.e used to reduced steady state error.and pid means proportional integrator and derivative controlle...

Rakesh

Mar 23rd, 2015

Power system is technology to transporting the energy to industry and home .And the power system basically work on three principle Generation,Transmission,and distribution.

vishnu sharma

Nov 26th, 2014

Catch the wire from both hands at a time in air, then potential difference is zero, so that current does not flow in body.

Santanu

Jul 9th, 2013

There is no risk of any shock as the whole body is at same potential. However, if the persons body touches ground or for that matter, anything which may create a potential difference, there will be el...

sarita

1- in one phase case : Phase is supply voltage weather neutral is returning path the same current for that supply voltage.
2- in three phase case :
- in balanced load current returned to earth = 0
- ...

Umesh

Sep 25th, 2014

We generally performs Short circuit test keeping initial voltage at lower value and then gradually increases it up to the level to get a full load current (or Max) through testing device or circuit. B...

KM Mahesha

Jul 22nd, 2014

Load are in LV side and also max SC faults occurred in Load side. If SC Faults occurs protect load and Net work system

manikandan.l

Star connected rotor of induction motor has a standstill impedance of (0.4+4j)ohm per phase and rheostat impedance per phase is (6+2j)ohm. The motor has induced voltage of 80v between slip-rings at st...

Alok Behera

Feb 12th, 2014

If the earthing transformer on the Delta Side is outsides the Zone of protection the Earth Fault(E/F)in the delta system outside Current Transformer(CT) locations would produce current distributions a...

Interview & Career Tips

Get invaluable Interview and Career Tips delivered directly to your inbox. Get your news alert set up today, Once you confirm your Email subscription, you will be able to download Job Inteview Questions Ebook . Please contact me if you there is any issue with the download.

This site uses cookies to deliver our services and to show you relevant ads and job listings. By using our site, you acknowledge that you have read and understand our
Cookie Policy,
Privacy Policy, and our
Terms of Service. Your use of GeekInterview’s Content, Products and Services, including the Exforsys Inc Network, is subject to these policies and terms.